| NOUN | substance | optical glass | clear homogeneous glass of known refractive index |
|---|
| Meaning | Clear homogeneous glass of known refractive index; used to make lenses. | |
|---|---|---|
| Narrower | optical crown, crown glass, optical crown glass | optical glass of low dispersion and low refractive index |
| optical flint, flint glass | optical glass of high dispersion and high refractive index | |
| Broader | glass | A brittle / brittle transparent solid with irregular atomic structure |
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